Radio apparatus



March 12, 1935. E, H. HAND RADIO APPARATUS Filed July 9, 1930 2 Sheets-Sheet l IIIIIIIIIIIIIIIA nu INVE TOR ATTORNEY Maih 12,1935. E. H. I -IAND RADIO APPARATUS Filed July 9, 1930 2 sheets-sheet 2 mv NTOR ATTORNEzS,

Patented Mar. 12, 1935 UNITED STATES PATENT OFFICE RADIO APPARATUS Application July 9, 1930, Serial No. 466,680

13 Claims.

. This invention relates to radio apparatus and has for an'object to provide means for easily and quickly changing the coils of a radio set to adapt it for use on different groups of wave lengths.

' Heretofore, in sets designed for; use on different groups of wave lengths, it has been necessary manually to remove the coils from their sockets and insert other coils when it was desired to change the set from one group of wave lengths to another group of wave lengths.

According to the present invention, the removal of the coils from their sockets and the insertion of other coils in such sockets is avoided. 'Coils for the different groups of wave lengths are mounted on a carrier and means are provided to actuate the carrier to connect in the circuits of the radio set, the proper coils to adapt the set .for use with the desired groups of wave lengths. The coils, after once being mounted on the carrier, do not have to be touched and are connected or disconnected from the circuits merely by actuation of the carrier.

Other objects, novel features and advantages of this invention will be apparent from the following specification and accompanying drawings, wherein: v

Fig. 1 is a section on the line 1--1 of Fig. 2.

Fig. 2 is an elevation of one embodiment of the invention.-

Fig. 3 is a fragmentary view similar to Fig. 2.

Fig. 4 is an enlarged section in line 4-4 of Fig. 1.

Fig. 5 is a perspective view of a portion of the apparatus.

Fig. 6 is a section on the line 6-6 of Fig. 2.

Fig. 7 is a plan view of a modified embodiment of the invention.

Fig. 8 is a section on the line 8-8 of Fig. 7.

Fig. 9 is a sectionon the line 9--9 of Fig. 7, and

Fig. 10 is a perspective view of a portion of the apparatus.

Referring now more especially to the form disclosed in Figs. 1 to 6 inclusive, 10 is a carrier provided with a plurality of radial partitions 11 forming compartments 11a. The carrier 10 is mounted upon a shaft 12 supported by the base plate 13. In each of the compartments 11a is arranged a transformer coil 14 havingterminals 15 which project through apertures in the floor of the carrier. The terminals 15 engage contact members 16 attached to and supported by the carrier 10 and having vertically depending arms 17.. The coils 14 are duigned for different wave lengths and may be arranged in pairs as shown in Fig. l. The carrier 10 and the partitions 11 may be formed of metal or may be formed of insulating material or the carrier may be formed of insulating material and the partitions of metal. When 5 the partitions are formed of metal they serve to shield the coils from each other. Also, when the carrier is made of metal, means are provided for insulating the terminals 15 and contact members 16 from the carrier.

A ring gear 18 is attached to the under face of the carrier 10 and the teeth of this gear mesh with the teeth of a pinion 19 mounted on a shaft 20 which is journalled in arms 21 and 22 extending from the base plate 13. The shaft 20 15 is made up in two hinged sections to one of which is hinged the knob 23. The other section is provided with a head 24 between which and the arm 21 is arranged a spring 25. This shaft may be pulled out to the position shown in Fig. 6 to 20 provide a crank arm for turning the shaft or it may be in the position shown in Fig. 1 when the knob 23 is rotated to turn the shaft. A panel 26 is provided in front of the arm 22. By means of the shaft 20, the pinion 19 may be rotated to move the carrier 10 into any desired position.

A plurality of metal members 2'? are supported by an insulator 28 attached to the bed plate 13 and the members 27 are provided with binding posts 29 to which are attached connecting wires of the radio set. Switch blades 30 are pivoted to the members 27 and are formed with clips 30a at their upper ends, these clips being adapted to engage the terminal 17. The switch members 30 are mounted in a frame 31 which maintains the switch blades in definite relationship. Two sets of the switch blades above described are provided and are arranged diametrically opposite to each other. Theframes 31 are linked together by rods 32 so that the two sets of switch blades are caused to swing in unison. A shaft 33 is journalled in the arms 21 and 22 and is provided with a crank arm 34, the end of which is connected to one of the bars 32. The shaft 33 is provided with a handle 35 and when the shaft 33 is turned by means of the handle 35, the switch blades are swung into either the position shown in Fig. 3, or the position shown in Fig. 2.

A locking member 36 is mounted on the shaft 33 and is provided with flat surfaces adapted to be engaged by the leaf spring 3'7 to resiliently hold the locking member in either of two positions. This locking member is provided with a convex and with a concave surface. A second locking member 38 is carried by the shaft 20 and is of circular contour except that it is provided with a curved cut-out into which the locking member 36 is adapted to rotate. The carrier 10 is rotated to bring the desired coils into appropriate position to have their terminals engaged by the knife blades 30, the latter being in the position shown in Fig. 3, while the carrier is being moved and the locking member 36 having its concave portion opposed to the locking member 38. The shaft 33 is then rotated by the handle 35, thereby bringing the switch blades 30 into the position shown in Fig. 2 and engaging the same with the contact members. Accurate alignment of the switch blades and the terminals is insured by rotation of the locking member 36 to bring its convex portion intothe cut-out portion of the locking member 38. At the same time, the member 36 looks the carrier 10 against rotation.

The ratio between the teeth of the pinion 19- and the ring gear 18 is such that one rotation of the pinion advances the carrier a distance equal to the distance between the center lines of adjacent compartments, thereby insuring proper position of the locking member 38 to cooperate with the locking member 36. Also, the carrier 10 is provided with indicia which may be viewed through an aperture in the panel 26 to indicate what group wave length coil is connected in the radio circuit.

Referring now to the modification disclosed in Figs. 7 to 10 inclusive, 50 is a carrier upon which are supported transformer coils 51 for diiferent groups of wave lengths, these coils being coaxial. The carrier 50 is supported by a shaft 52 pivoted in the ends of a cylindrical casing 53 surrounding the 'carrier and being supported by brackets 54. Each coil is provided with a plurality of terminals 55, the terminals for each coil being uniformly spaced and the terminals for successive coils being uniformly oifset. A plurality of brackets 56 are supported within the casing 53 and extend axially of the carrier 50. Each of these brackets is provided with a set of serially connected contact members 57, each set being connected with one of the leads to the radio set. Each contact member is adapted to be engaged by a terminal of one of the coils 51 and only one contact member 57 of a set can be engaged at one time with a terminal 55 because of the offset arrangement of the terminals of the different coils. Each contact member 57 is provided with a notch 57a to receive the end of the terminal 55, thereby resiliently locking the carrier. Rotation of the carrier 50 thus is effective to con nect the desired wave length coils in the radio circuit.

A worm wheel. 58 is connected to one end of the shaft 52 and meshes with a worm gear 59 mounted on a shaft 60 journalled in brackets 61 supported by the base plate 62 which likewise supports the brackets 54. A panel 63 is provided in front of one of the brackets 61 and the shaft 60 extends through this panel and is provided with a knob 64. The shaft 60 carries a pinion 65 which meshes with a gear 66 mounted'on the shaft 67 supported by the bracket 61. A dial 68 is rotatable with the gear 66 and is visible through a .window in the panel 63. Indicia are provided on the dial 68 to indicate which coil is connected in the radio circuit.

The carrier 50 may be rotated to connect or disconnect from the radio circuits various coils 51. this rotation being effected by means of the knob 64. The indicia on the dial 68 idicate the selected coil and the contact members 57 serve to hold the carrier against accidental rotation.

The form disclosed in Fig. 1 is designed primarily for use with sets utilizing both antenna and detector coils but it is apparent that this arrangement may also be used with radio sets having but a sjngle coil. In that event, but one set of switch members would be required and the coils would all be diflferent instead of being in pairs. Likewise, while the modification disclosed in Figs. 7 to 10 inclusive is designed primarily for radio sets utilizing but a single coil, it is apparent that this arrangement may be utilized in sets having two coils. Furthermore, it is to be understood that various modifications may be made in the device above described, without in any way departing from the spirit of the invention as defined in the appended claims.

'I claim:

1. In a device of the character described, a rotatable carrier, a plurality of coils supported by said carrier, terminals for said coils, contacts engageable by said terminals in different positions of the carrier, means to rotate said carrier, and conductive partitions between adjacent coils.

2. In a device of the character described, a rotatable carrier, a plurality of coils separated by shields and supported by said carrier, contacts on said carrier connected with the terminals of said coils, a group of fixed contact members adapted to be engaged by the contacts connected with said coils, and means to rotate said carrier to effect engagement of the contacts connected to the terminals of a selected coil with said fixed contact members.

3. In a device of the character described, a rotatable carrier, a plurality of coils supported by said carrier, a group of terminals for each coil, a group of contact members, means to rotate said carrier to locate a selected group of terminals in position to be engaged by said group of contact members, and means for moving said contact members into engagement with said terminals and locking said carrier against rotation.

4. In a device of the character described, a rotatable carrier, means to rotate said carrier, a plurality of coils supported by said carrier, a group of terminals for each coil, two groups of contact members movable into engagement with two groups of terminals, and means for simultaneously moving said contact members into engagement with selected groups of terminals and locking the carrier against rotation.

5. In a device of the character described,.a rotatable carrier, a circular row of coils supported by said carrier, a group oi! terminals for each coil, 9. group of pivoted contact members adapted to engageany selected group of terminals, means for rotating said carrier. and means for swinging said contact members into engagement with the terminals of a selected group and locking said carrier against rotation.

6. In a device of the character described, a rotatable carrier, a circular row of coils supported by said carrier, 9. group of terminals for each coil, 9. pair of groups of pivoted contact members rotation of said carrier, a plurality of radially extending terminals for each coil, the corresponding terminals for the different coils being angularly offset, a plurality of groups of stationary contact members adapted to be engaged by said terminals, each contact member being adapted successively to be engaged by the terminals of one coil only, and means for rotating said carrier.

8. An inductance system comprising in combination a metallic cylinder adapted to rotate on its axis, a plurality of inductance coils enclosed in said cylinder, and means for selectively making electrical connection with each of said inductance coils as said cylinder is rotated.

-9. An inductance system comprising in combination a metallic cylinder adapted to rotate on its axis, said cylinder enclosing a plurality of inductance coils, and each of said coils individually shielded from the other, and means for selective- 1y making electrical connection with each of said inductance coils as said cylinder is rotated.

10. An inductance system comprising, in combination, a cylindrical member mounted for rotation on its axis, said cylindrical member being divided by partitions into several compartments, separate inductances removably mounted within said compartments in said cylindrical member, said inductances being mounted on axes parallel with the axis of said cylindrical member, groups of contacts connected to said inductances and extending from said member, there being a group of contacts for each inductance, and contact members externally of said member and adjacent thereto in the paths of said groups of contacts to selectively engage the said groups of contactson rotation ofsaid cylindrical member.

11. An inductance system comprising, in combination, a closure member, a plurality of metal- -lic partitions therein for dividing said closure member into separate compartments, an inductance in each of said compartments, said inductances being shielded from each other by said partitions, groups of contacts connected to said inductances and extending through said closure member, there being a group of contacts for each inductance, a group of contacts externally of said member, and means for producing relative movement between said groups of contacts extending through said member and said group of contacts externally of said member for selectively making electrical connection between each inductance coil in said member and said group of external contacts.

12. An inductance system comprising, in combination, a cylindrical member mounted for rotation on its axis, a plurality of separate inductances mounted within said member and coaxially therewith, groups of contacts connected to said inductance and extending from said cylindrical member, said contacts serving for supports for said inductances, there being a group 01' contacts for each inductance, and contact members externally of said member and adjacent thereto in the paths of said groups of contacts to selectively engage the said groups of contacts on rotation of said cylindrical member.

13. An inductance system comprising, in combination, a cylindrical member adapted to rotate on its axis, a plurality of socket members located within said cylindrical member for rotation therewith, inductances of the plug-in type in said socket members, said inductances being on forms terminating in contacts which retain said forms in said sockets and extend through said cylindrical member, a group of contacts fixed externally of said cylinder in the path of said first named groups of contacts when said cylinder is rotated, and means for rotating said cylinder for selectively making electrical connection between each inductance coil in said cylinder and said group of external contacts.

ERLE H. HAND. 

